CodeMirror.defineMode("velocity", function (config) {
  function parseWords(str) {
    var obj = {}, words = str.split(" ");
    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
    return obj;
  }

  var indentUnit = config.indentUnit
  var keywords = parseWords("#end #else #break #stop #[[ #]] " +
    "#{end} #{else} #{break} #{stop}");
  var functions = parseWords("#if #elseif #foreach #set #include #parse #macro #define #evaluate " +
    "#{if} #{elseif} #{foreach} #{set} #{include} #{parse} #{macro} #{define} #{evaluate}");
  var specials = parseWords("$foreach.count $foreach.hasNext $foreach.first $foreach.last $foreach.topmost $foreach.parent $velocityCount");
  var isOperatorChar = /[+\-*&%=<>!?:\/|]/;
  var multiLineStrings = true;

  function chain(stream, state, f) {
    state.tokenize = f;
    return f(stream, state);
  }

  function tokenBase(stream, state) {
    var beforeParams = state.beforeParams;
    state.beforeParams = false;
    var ch = stream.next();
    // start of string?
    if ((ch == '"' || ch == "'") && state.inParams)
      return chain(stream, state, tokenString(ch));
    // is it one of the special signs []{}().,;? Seperator?
    else if (/[\[\]{}\(\),;\.]/.test(ch)) {
      if (ch == "(" && beforeParams) state.inParams = true;
      else if (ch == ")") state.inParams = false;
      return null;
    }
    // start of a number value?
    else if (/\d/.test(ch)) {
      stream.eatWhile(/[\w\.]/);
      return "number";
    }
    // multi line comment?
    else if (ch == "#" && stream.eat("*")) {
      return chain(stream, state, tokenComment);
    }
    // unparsed content?
    else if (ch == "#" && stream.match(/ *\[ *\[/)) {
      return chain(stream, state, tokenUnparsed);
    }
    // single line comment?
    else if (ch == "#" && stream.eat("#")) {
      stream.skipToEnd();
      return "comment";
    }
    // variable?
    else if (ch == "$") {
      stream.eatWhile(/[\w\d\$_\.{}]/);
      // is it one of the specials?
      if (specials && specials.propertyIsEnumerable(stream.current().toLowerCase())) {
        return "keyword";
      }
      else {
        state.beforeParams = true;
        return "builtin";
      }
    }
    // is it a operator?
    else if (isOperatorChar.test(ch)) {
      stream.eatWhile(isOperatorChar);
      return "operator";
    }
    else {
      // get the whole word
      stream.eatWhile(/[\w\$_{}]/);
      var word = stream.current().toLowerCase();
      // is it one of the listed keywords?
      if (keywords && keywords.propertyIsEnumerable(word))
        return "keyword";
      // is it one of the listed functions?
      if (functions && functions.propertyIsEnumerable(word) ||
        stream.current().match(/^#[a-z0-9_]+ *$/i) && stream.peek() == "(") {
        state.beforeParams = true;
        return "keyword";
      }
      // default: just a "word"
      return null;
    }
  }

  function tokenString(quote) {
    return function (stream, state) {
      var escaped = false, next, end = false;
      while ((next = stream.next()) != null) {
        if (next == quote && !escaped) {
          end = true;
          break;
        }
        escaped = !escaped && next == "\\";
      }
      if (end) state.tokenize = tokenBase;
      return "string";
    };
  }

  function tokenComment(stream, state) {
    var maybeEnd = false, ch;
    while (ch = stream.next()) {
      if (ch == "#" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "*");
    }
    return "comment";
  }

  function tokenUnparsed(stream, state) {
    var maybeEnd = 0, ch;
    while (ch = stream.next()) {
      if (ch == "#" && maybeEnd == 2) {
        state.tokenize = tokenBase;
        break;
      }
      if (ch == "]")
        maybeEnd++;
      else if (ch != " ")
        maybeEnd = 0;
    }
    return "meta";
  }

  // Interface

  return {
    startState:function (basecolumn) {
      return {
        tokenize:tokenBase,
        beforeParams:false,
        inParams:false
      };
    },

    token:function (stream, state) {
      if (stream.eatSpace()) return null;
      return state.tokenize(stream, state);
    }
  };
});

CodeMirror.defineMIME("text/velocity", "velocity");
